Dynamo-electric machine



(No Model.)

W. RBEMAN. DYNAMO BGTRIG MACHINE. No. 440,424. Patented Nov. 11,1890.

e Wl-r-IJEESES.

IPH/E 'rm UNITED STATES PATENT OFFICE.

TALTER K. FREEMAN, OF BROOKLYN, NEV YORK, ASSIGNOR TO VILLIAM S.IIADA'WAY, JR., TRUSTEE, OF BOSTON, MASSACHUSETTS.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 440,424, dated NovemberI1, 1890.

Application led September 20, 1890. Serial No. 365,672. (No model.)

To aZZ wwm it may concer/L: cured in accordance with my invention; an-

Be it known that I, VALTER K. FREEMAN, other-the middle onedshowing thecoil-sea citizen of the United States, and a resident curing appliancesWith the coil removed,and of Brooklyn, in the county of Kings and Statethe third or remaining one appearing without 5 5 of New York, haveinvented certain useful either coil or securing appliances. Fig. 2 isImprovements in Dynamo-Electric Machines; a plan view of the removablehead of one of and I do hereby declare the following to be a the coils.Fig. 3 is a view of one of the sefull and exact description of the same,which curing-bolts and its nut. Fig. 1t is a cross- Will enable othersskilled in the art to which sectional View taken on the line m fr, Fig.I. 6o ro the invention appertains to make and use the Similar letters ofreference in the several same. figures indicate the same parts.

My invention relates particularly to im- The letter A indicates thekeeper of the proved means for securing the coils upon thefield-magnets; B, the cores, formed integral cores of the field-magnetsof a dynamoelcc therewith and constructed, preferably, of ta- 6 5 tricmachine. pering form, as shown.

In dynamo-machines as usually constructed O are the coils of wireadapted to be slipped the cores of the iield^magnets are rigidly seuponthe cores, and D are the heads which, cured to or formed integral withthe keeper, in connection with the bolts E and nuts F, and the coils areslipped upon the cores and hold the coils in place upon their respective7o zo are held in place by a head, which is usually cores.

either secured to the core by .screws or pins The bolts E, instead ofpassing through the or by means of bolts passed through the head heads Don-the outside of the coils as formerly, on the outside of the cores andthrough the in my present invention pass through inkeeper. W'here screwsor pins are employed, wardly-projecting lugs G on said heads, as 75 thevibrations and strains to which they are shown in Fig. 2, and thencethrough grooves subjected during the running of the machine or channelsH, formed in the sides of the frequently cause them to become broken orcores B, as shown in Fig. 1, and thence through loosened and permit theheads and the coils the keeper A, where they receive the nuts F, to dropdown upon the armature. On the as shown in Figs. l and a. The heads e ofSe 3o other hand, where the outside bolts are used the bolts E arecountersunk ilush with the they are unsightly and, being exposed, affordsurface of the lugs G, and for the purpose of surfaces for theaccumulation of dust from securing a firmer connection between the themachine7 and on these accounts are obparts the said lugs Gare extendedbeyond the jectionable. surface of the heads D and caused to enter 85The object of my invention is to so consockets 7i in the cores l5, asrepresented in struct and dispose the means by which the Figs. l and et.In assembling the parts the coils are held in place upon their cores asthat coils are iirst slipped upon the cores, then the they will bestronger and more secure than heads are put in position, and, finally,the heretofore, and at the same time be entirely bolts E are insertedthrough the lugs of the 9o 4o concealed from view and from the access ofheads and secured by the application of the dust from the machine. nutsto their outer ends, as shown in Fig. l.

To this end my invention consists in the It will be observed that inthis construction novel construction and combinations of parts the boltsare entirely hid from View, and that hereinafter described, and pointedout spethe lateral support afforded by the grooves 95 ciically in theclauses of the claim at the close H, as well as the further lateralsupport afof this specification. forded by the co-operation of the lugsG with Referring to the accompanying drawings, the sockets 7L, preventsthe displacement of Figure I represents a segment of the keeper theheads and renders the whole connection of the field-magnets of analternating-current very strong and secure. roo

5o dynamo, showing three cores, one of which- IVhile my invention isherein shown as apthe right-hand oneis covered by a coil seplied to thefield-magnets of a dynamo-electric machine, it is evident that theprinciple of securing the coil upon its core is of Wider and moregeneral application.

Having thus described my invcntiornwhat I claim as new isl. The -combination, substantially as described, of a core, a coil, a removable headsurrounding the pole of .the core for holding the coil upon the core,and bolts by which the head is held in place passed through the head onthe inside of the coil, as set forth.

2. The combination, substantially as described, of a grooved core, acoil, a removable head for holding the coil upon the core, and boltspassed through the head and through the grooves inthe core, as setforth.

3. The combination, substantially as described, of a grooved core, acoil, a removable head for holding the coil upon the core provided withthe perforated lugs, and the bolts passing through the lugs of the headand the grooves of the core, as set forth.

4. The combination, substantially as ded Witnesses:

MELVILLE CHURCH, WILLIAM S. HADAWAY, Jr.

